I've qgis 1.6.0 and 1.7.0 installed Win versions). A project that I had in 1.6 was opened and saved in 1.7. When I attempt to open the project in 1.6, 1.6 crashes. Question: is it possible to save a 1.7 project as an older version (ala 1.6) so that it can be used in both versions?